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javascript - GraphQL AWS Amplify @connection 未引入连接数据

问题描述

如您所见，我希望在联赛表中列出所有赛季和分区data > seasons。我已经设置了它，因为我相信它可以使用@connection。

所以问题是，我将如何更改我的部门架构，以便将部门包含在League.

我花了很长时间阅读@connections和@keyID并了解在使用密钥时会使用我给他们的密钥创建哈希。但是我多次阅读连接文档后，我对为什么这不起作用的理解不够。

我很想更好地理解这一点，所以我尽我所能去理解！

nb 我相信值得一提的是，每次我更改架构并amplify mock重建哈希键时，它们都会被添加。我想知道这是否有一些影响？当涉及键时，我是否应该在每次架构更改时完全清理 SQLite？ 在此处输入图像描述

联赛模式

type League @model
{
  id: ID!
  name: String!
  faId: ID!
  logo: String
  seasons: [Season] @connection(keyName: "bySeason", fields: ["id"])
  division: [Division] @connection(keyName: "byDivision", fields: ["id"])
}

四季沙马

type Season @model @key(name: "bySeason", fields: ["leagueID"])
{
  id: ID!
  name: String!
  faId: ID!
  yearStart: AWSDate
  yearEnd: AWSDate
  leagueID: ID!
  league: League! @connection(fields: ["leagueID"])
  division: [Division] @connection(keyName: "byDivision", fields: ["id"])
}

划分模式

type Division @model
@key(name: "byDivisionFromSeason", fields: ["leagueID" "name"])
@key(name: "byDivision", fields: ["seasonID", "leagueID"])
{
  id: ID!
  name: String!
  faId: ID!
  divisionSeasonFaId: String
  leagueID: ID!
  seasonID: ID!
  league: League! @connection(fields: ["leagueID"])
  season: Season! @connection(fields: ["seasonID"])
  teams: [TeamConnection] @connection(keyName: "byTeamDivision", fields: ["id"])
  games: [Game] @connection(keyName: "byGameForDivision", fields: ["id"])
  ageInput: String!
  level: Int!
}

查询

  listLeagues {
    items {
      name
      division {
        items {
          name
        }
      }
      seasons {
        items {
          name
          division {
            items {
              name
            }
          }
        }
      }
    }
  }

数据

我在这里证明了结构是正确的，因为Seasons包含League在Divisions其中

{
  "data": {
    "listLeagues": {
      "items": [
        {
          "name": "Southern Amateur League",
          "division": {
            "items": []
          },
          "seasons": {
            "items": [
              {
                "name": "2020-21",
                "division": {
                  "items": [
                    {
                      "name": "Junior Section Division 5B South"
                    },
                    {
                      "name": "Junior Section Division 4 South"
                    },
                    {
                      "name": "Intermediate Division 3"
                    },
                  ]
                }
              },
              {
                "name": "2019-20",
                "division": {
                  "items": []
                }
              },
            ]
          }
        }
      ]
    }
  }
}

编辑

由于仅将除法上的键减少到seasonID每个leagueID键上，因此在清除数据时似乎会引发异常错误。我曾相信 @connection 上的 return null 是完全有效的？

在此处输入图像描述

标签： javascriptamazon-web-servicesgraphqlamazon-dynamodbaws-amplify

解决方案

也许这应该是评论而不是实际答案，但我需要描述架构，如果您认为合适，我稍后会删除它。

杰米，只是为了测试，你能试试下面的模式吗？它基本上与 Nader 提出的模式相同，只是name从keys on 中删除了该字段Division：

type League @model
{
  id: ID!
  name: String!
  faId: ID!
  logo: String
  seasons: [Season] @connection(keyName: "bySeason", fields: ["id"])
  division: [Division] @connection(keyName: "byDivision", fields: ["id"])
}

type Season @model @key(name: "bySeason", fields: ["leagueID"])
{
  id: ID!
  name: String!
  faId: ID!
  yearStart: AWSDate
  yearEnd: AWSDate
  leagueID: ID!
  league: League! @connection(fields: ["leagueID"])
  division: [Division] @connection(keyName: "byDivisionFromSeason", fields: ["id"])
}

type Division @model
@key(name: "byDivisionFromSeason", fields: ["seasonID", "leagueID"])
@key(name: "byDivision", fields: ["leagueID", "seasonID"])
{
  id: ID!
  name: String!
  faId: ID!
  divisionSeasonFaId: String
  leagueID: ID!
  seasonID: ID!
  league: League! @connection(fields: ["leagueID"])
  season: Season! @connection(fields: ["seasonID"])
  teams: [TeamConnection] @connection(keyName: "byTeamDivision", fields: ["id"])
  games: [Game] @connection(keyName: "byGameForDivision", fields: ["id"])
  ageInput: String!
  level: Int!
}

我认为您获得的错误，即：

"errors": [ { "message": "Query condition missed key schema element", "errorType": "DynamoDB:ValidationException", "data": null, "errorInfo": null, "path": [ "listLeagues", "items", 1, "division" ], "locations": [ { "line": 10, "column": 9, "sourceName": "GraphQL request" } ] }

可以通过使用条件运行查询来激发name。

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